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High temperature elastic anisotropy of the perovskite and post-perovskite polymorphs of Al2O3
Department of Earth Sciences, University College London, London, UK
Department of Earth Sciences, University College London, London, UK
Department of Earth Sciences, University College London, London, UK
Finite temperature ab initio molecular dynamics calculations were performed to determine the high temperature elastic and seismic properties of the perovskite and post-perovskite phases of pure end-member Al2O3. The post-perovskite phase exhibits very large degrees of shear-wave splitting. The incorporation of a few mole percent of Al2O3 into MgSiO3 is predicted to have little effect on the perovskite to post-perovskite phase transition pressure and seismic properties of the post-perovskite phase; although a small difference in shear-wave splitting may be observable.
Received 6 April 2005; accepted 18 May 2005; published 6 July 2005.
Citation: (2005), High temperature elastic anisotropy of the perovskite and post-perovskite polymorphs of Al2O3, Geophys. Res. Lett., 32, L13305, doi:10.1029/2005GL023163.
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